Battery Cell End-Wall Drainage Structure for Electrolyte Leakage

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Solution Overview

Problem

The reliability of batteries is compromised due to electrolyte leakage, which can lead to short circuits and safety risks such as fire and explosion, particularly when the battery is inverted or subjected to impact.

Innovation Solution

A protective member is placed on the outer surface of the first end wall of the battery cell housing, featuring through holes and drainage channels that facilitate directional liquid discharge, constraining and guiding electrolyte solution away from conductive components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the battery is inverted or subjected to impact, then electrolyte leakage occurs leading to short circuits, but the reliability and safety of the battery deteriorates

Engineering Contradiction:

Improvebattery reliabilityVSAvoidelectrolyte leakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a protective member as an intermediary component between the electrolyte and conductive components. This protective member includes a drainage channel that acts as a mediator to guide leaked electrolyte away from conductive parts, preventing direct contact and short circuits while maintaining battery reliability under inverted or impacted conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful effect of electrolyte leakage into a beneficial outcome by designing a drainage channel system. Instead of preventing leakage entirely, the system allows controlled drainage of electrolyte through the protective member to a safe discharge location, transforming the potential hazard into a managed flow that prevents more serious damage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If a protective member with drainage channel is added to constrain and guide electrolyte, then safety and reliability improve, but device complexity increases

Engineering Contradiction:

Improvebattery safetyVSAvoidbattery structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective member serves multiple functions simultaneously: it acts as a physical barrier to constrain electrolyte, provides a drainage channel for guided flow, and creates a controlled discharge path. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity while achieving improved safety

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the protective barrier function and the drainage guidance function into a single integrated protective member structure. By combining these functions rather than using separate components, the design minimizes the increase in device complexity while maintaining comprehensive safety protection

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250323377A1Battery cell, battery, and power consuming device

Publication Date: 2025.10.16 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

A battery cell includes a housing, an electrode terminal, and an isolating member. The housing includes a first end wall; the electrode terminal is disposed on the first end wall; and the isolating member covers an outer surface of the first end wall. A first through hole and a second through hole are provided on the isolating member. The first through hole is configured to expose the electrode terminal, and the second through hole is configured to discharge liquid between the isolating member and the first end wall.